CN-122016042-A - Light path system of ball-carried ultraviolet spectrometer

CN122016042ACN 122016042 ACN122016042 ACN 122016042ACN-122016042-A

Abstract

The invention discloses an optical path system of a ball-carried ultraviolet spectrometer, which belongs to the field of optical instrument design and solves the problems of low efficiency and poor image quality of the traditional optical path broadband, wherein the system comprises a front-end receiving and transmitting module, a rear-end spectrum detecting module, a back-end spectrum detecting module and a back-end light source, wherein the front-end receiving and transmitting module comprises a light collecting lens (f=200 mm), an ultraviolet enhancement integrating sphere (reflectivity is more than or equal to 90%) and an ultraviolet optical fiber, and the back-end spectrum detecting module comprises a slit (10 mu m wide), a collimating lens (f=79+/-0.4 mm), a reflective blazed grating, an imaging lens (f=106+/-0.4 mm) and a back-illuminated ultraviolet CCD (6.5 mu m pixel). The lens is made of fused quartz or calcium fluoride material suitable for ultraviolet band, and other elements are treated by a film coating and the like, so that the light path coverage is ensured to be 200-400nm. And the space dimension image quality is obviously improved by adopting a long slit and aberration optimization design. The optical path of the invention has the characteristics of wide band, high luminous flux, high image quality and high integration level.

Inventors

JI HANGXIN
PAN JINYU
ZHANG XIAOJIE
CHEN RU
YU HAORAN

Assignees

中国科学院南京天文光学技术研究所

Dates

Publication Date: 20260512
Application Date: 20260214

Claims (10)

1. The light path system of the ball-carried ultraviolet spectrometer is characterized by comprising a front end receiving transmission module and a rear end spectrum detection module which are connected in sequence by a light path; The front end receiving and transmitting module comprises a light collecting lens, an integrating sphere and an ultraviolet light fiber which are sequentially arranged along a light path, wherein the light collecting lens is used for receiving and converging external ultraviolet light, the integrating sphere is used for homogenizing converged light, and a light outlet of the integrating sphere is coupled with an input end of the ultraviolet light fiber; the rear-end spectrum detection module comprises an incident slit, a collimating lens, a reflection grating, an imaging lens and an area array CCD detector which are sequentially arranged along an optical path; The divergent light emitted from the entrance slit is collimated into parallel light beams by a collimating lens, the parallel light beams irradiate the reflecting grating with a preset incident angle, the non-zero order of the reflecting grating disperses the received white light, and the monochromatic light after the dispersion of the blazed order is received and converged into monochromatic light by an imaging lens; The area array CCD detector is overlapped with the imaging surface and is used for receiving the converged monochromatic light to complete spectral imaging; the optical path system adopts a long slit design, optimizes the aberration of the collimating lens and the imaging lens, and is used for improving the imaging quality of the slit in the length direction.
2. The optical path system of the ball-carried ultraviolet spectrometer according to claim 1, wherein the focal length of the light collecting lens is 200mm, the caliber is 100mm, and the inner wall of the integrating sphere is coated with an ultraviolet enhancement coating.
3. The optical path system of the ball-mounted ultraviolet spectrometer according to claim 1, wherein the collimating lens comprises a first lens having positive optical power, a third lens having positive optical power, a fourth lens having negative optical power, a fifth lens having positive optical power, a sixth lens having positive optical power, and a stop ST, which are sequentially connected; The object side surface of the first lens with positive focal power is a convex surface, and the image side surface of the first lens is a convex surface; the object side surface of the second lens with negative focal power is a concave surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens with positive focal power is a convex surface, and the image side surface of the third lens with positive focal power is a convex surface; the object side surface of the fourth lens with negative focal power is a concave surface, and the image side surface of the fourth lens is a concave surface; the object side surface of the fifth lens with positive focal power is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens with positive focal power is concave, and the image side surface of the sixth lens with positive focal power is convex.
4. The optical path system of the ball-mounted ultraviolet spectrometer according to claim 1, wherein the imaging lens comprises a seventh lens with positive optical power, an eighth lens with negative optical power, a ninth lens with negative optical power, a tenth lens with positive optical power, an eleven lens with positive optical power, a twelve lens with positive optical power, and an imaging surface, which are sequentially connected; The object side surface of the seventh lens with positive focal power is a convex surface, and the image side surface of the seventh lens is a convex surface; The object side surface of the eighth lens with negative focal power is a concave surface, and the image side surface of the eighth lens is a concave surface; the object side surface of the ninth lens with negative focal power is a concave surface, and the image side surface of the ninth lens with negative focal power is a concave surface; the object side surface of the tenth lens with positive focal power is a convex surface, and the image side surface of the tenth lens is a convex surface; the object side surface of the eleven lens with positive focal power is a concave surface, and the image side surface of the eleven lens with positive focal power is a convex surface; the object side surface of the twelve lenses with positive focal power is a convex surface, and the image side surface of the twelve lenses with positive focal power is a convex surface.
5. The optical path system of the ball-borne ultraviolet spectrometer according to claim 4, wherein the image side surface of the eighth lens is an even aspherical surface, and the surface shape satisfies the following conditions: Wherein z is the distance between the curved surface and the curved surface vertex in the optical axis direction, r is the distance between the optical axis and the curved surface, c is the curvature of the curved surface vertex, k is the quadric surface coefficient, and alpha 1 、α 2 、α 3 、α 4 、α 5 、α 6 、α 7 、α 8 is the second, fourth, sixth, eighth, tenth, fourteen and sixteen order surface coefficients respectively.
6. The optical path system of the ball-mounted ultraviolet spectrometer according to claim 1, wherein the width of the incident slit is 10 μm, the focal length of the collimating lens is 79mm, the maximum lens caliber is 18mm, and the focal length of the imaging lens is 106mm, and the maximum lens caliber is 38mm.
7. The light path system of the ball-borne ultraviolet spectrometer according to claim 1, wherein the reflection grating is a planar reflection blazed grating or a prism beam-splitting system made of ultraviolet fused quartz.
8. The light path system of the ball-mounted ultraviolet spectrometer of claim 1, wherein the area array CCD detector is a back-illuminated ultraviolet-enhanced CCD or a back-illuminated ultraviolet CMOS detector.
9. The optical path system of the ball-mounted ultraviolet spectrometer according to claim 1, wherein the rear-end spectrum detection module is integrally sealed in a cavity filled with inert gas.
10. The optical path system of the ball-mounted ultraviolet spectrometer according to claim 1, wherein the back-end spectrum detection module further comprises a power adapter connected behind the area array CCD detector.

Description

Light path system of ball-carried ultraviolet spectrometer Technical Field The invention belongs to the technical field of optical instrument design, and particularly relates to an optical path system of a ball-carried ultraviolet spectrometer. Background The optical path system of the ultraviolet spectrometer is the core, and determines the spectral range, resolution, signal-to-noise ratio and stability of the instrument. The ultraviolet spectrometer light path for high-altitude ball-carried detection needs to meet special requirements, namely, needs to cover a wide band of 200-400nm which is important for atmospheric research, and needs to realize high light collection efficiency and high image quality under the limit of limited volume and weight. In the prior art, a miniature ultraviolet spectrometer adopts a simplified light path of a light source-miniature collimating lens group-triple prism-parallel glass plate-cylindrical lens-area array detector, but the light path can be represented in a wave band of 300-400nm, the triple prism is used as a dispersion element, the efficiency is low in a wave band of 200-300nm, and the traditional C-T structure adopts a Czerny-Turner (C-T) structure, but the traditional C-T structure is poor in image quality in the length direction (space dimension) of a slit, and the structure is relatively complex and large in volume. Furthermore, existing optical path designs do not adequately account for adaptation to lightweight integrated structures, and how stray light is suppressed by the optical path design itself. Therefore, a novel ultraviolet light path system which is specially optimized for the ball-carried environment is needed, and the novel ultraviolet light path system has excellent compactness and image quality while realizing efficient light source collection, broadband and high-precision detection. Disclosure of Invention Aiming at the defects of the light path system of the ball-carried ultraviolet spectrometer in the aspects of broadband efficiency, image quality stability and environmental adaptability in the prior art, the invention provides the light path system of the ball-carried ultraviolet spectrometer, adopts a two-section design combining transmission and reflection, optimizes slit direction image quality, combines a miniaturized structural design with a sealed inert gas environment, and ensures high performance and stability under the limited space of an extremely high altitude environment. The invention provides a light path system of a ball-carried ultraviolet spectrometer, which comprises a front end receiving and transmitting module and a rear end spectrum detecting module which are connected in sequence by a light path; The front end receiving and transmitting module comprises a light collecting lens, an integrating sphere and an ultraviolet light fiber which are sequentially arranged along a light path, wherein the light collecting lens is used for receiving and converging external ultraviolet light, the integrating sphere is used for homogenizing converged light, and a light outlet of the integrating sphere is coupled with an input end of the ultraviolet light fiber; the rear-end spectrum detection module comprises an incident slit, a collimating lens, a reflection grating, an imaging lens and an area array CCD detector which are sequentially arranged along an optical path; The divergent light emitted from the entrance slit is collimated into parallel light beams by a collimating lens, the parallel light beams irradiate the reflecting grating with a preset incident angle, the non-zero order of the reflecting grating disperses the received white light, and the monochromatic light after the dispersion of the blazed order is received and converged into monochromatic light by an imaging lens; The area array CCD detector is overlapped with the imaging surface and is used for receiving the converged monochromatic light to complete spectral imaging; the optical path system adopts a long slit design, optimizes the aberration of the collimating lens and the imaging lens, and is used for improving the imaging quality of the slit in the length direction. Further, the focal length of the light collecting lens is 200mm, the caliber is 100mm, and the inner wall of the integrating sphere is coated with an ultraviolet enhancement coating. Further, the collimating lens includes a first lens having positive power, a third lens having positive power, a fourth lens having negative power, a fifth lens having positive power, a sixth lens having positive power, and a stop ST, which are sequentially connected; The object side surface of the first lens with positive focal power is a convex surface, and the image side surface of the first lens is a convex surface; the object side surface of the second lens with negative focal power is a concave surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens with po